searchPrams

class MyURLSearchParams {    /**     * @params {string} init     */    constructor(init) {        this.map = new Map();        init = init[0] === '?' ? init.slice(1) : init;        const paramArr = init.split('&') ?? [];        //  console.log(paramStr);        for (let i in paramArr) {            const [key, value] = paramArr[i].split('=');            const curArr = this.map.get(key) || [];            this.map.set(key, [...curArr, String(value)]);        }    }
    /**      * @params {string} name     * @params {any} value     */    append (name, value) {        this.map.get(name).push(String(value));    }
    /**     * @params {string} name     */    delete (name) {        this.map.delete(name);    }
    /**     * @returns {Iterator}      */    * entries () {        for (let [key, values] of this.map) {            for (let value of values) {                yield [key, value];            }        }    }
    /**     * @param {(value, key) => void} callback     */    forEach (callback) {        for (let [key, values] of this.map) {            for (let value of values) {                callback(value, key);            }        }    }
    /**     * @param {string} name     * returns the first value of the name     */    get (name) {        return this.map.has(name) ? this.map.get(name)[0] : null;    }
    /**     * @param {string} name     * @return {string[]}     * returns the value list of the name     */    getAll (name) {        return this.map.get(name) ?? [];    }
    /**     * @params {string} name     * @return {boolean}     */    has (name) {        return !!this.map.has(name);    }
    /**     * @return {Iterator}     */    keys () {        return this.map.keys();    }
    /**     * @param {string} name     * @param {any} value     */    set (name, value) {        this.map.set(name, [String(value)]);    }
    // sor all key/value pairs based on the keys    sort () {        this.map = new Map([...this.map.entries()].sort())    }
    /**     * @return {string}     */    toString () {        let paramStr = '';        for (let [key, values] of this.map) {            for (let value of values) {                paramStr += `${key}=${value}&`;            }        }        return paramStr.slice(0, paramStr.length - 1);    }
    /**     * @return {Iterator} values     */    * values () {        for (let [_, values] of this.map) {            for (const value of values) {                yield value            }        }    }}const params = new MyURLSearchParams('?a=1&a=2&b=2')
params.getAll()